O Level Chemistry Study App | Save Energy: O Level Chemistry MCQs e-Book PDF

O Level Chemistry MCQs (O Level) From Textbook

O Level Chemistry MCQs – Certification Test 638

Save Energy: O Level Chemistry MCQs (Question 638) – App & e-Book Download

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MCQ 638: Purpose of Lean Burn engines is to:

  1. produce less air pollution
  2. consume lesser oxygen
  3. produce more efficient fuel combustion
  4. use them in sky rockets

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